JPH11228002A - Control method for feeding of resin sheet having printing pattern - Google Patents

Abstract

PROBLEM TO BE SOLVED: To set a newly fed sheet in a correct forming position by detecting the mark of a resin sheet fed at a low speed by a sensor installed near a forming device, feeding the sheet by a specified length at a high speed after the mark detection and repeating stopping for a fixed period. SOLUTION: A resin sheet (s) set in a carrier device 1 is fed toward a forming device 8 at a low speed, and the mark of the resin sheet (s) is detected by a sensor 20. After the mark detection, the rotational speed of a servo motor device 5 is increased by a command from a controller 30, and the resin sheet (s) is fed by a specified length equal to one shot at a high speed and then stopped for a fixed period. During this stoppage, work such as heating, forming, trimming or the like is performed for the resin sheet (s), and after the passage of the stopping period, the resin sheet (s) is fed again at a low speed, and then series of these operations are repeated in sequence. Thus, without any manual setting, replenishing of resin sheets and adjusting work are carried out easily within a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling the feeding of a resin sheet with a printed pattern in a molding apparatus for molding a molded article with a printed pattern.

[0002]

2. Description of the Related Art Conventionally, marks formed at regular intervals and side edges of a continuous resin sheet having a printed pattern corresponding to the mark are gripped by a clamp chain to form the resin sheet. In the method for controlling the feeding of a resin sheet using a conveying device that intermittently feeds a predetermined length to a resin sheet, the leading end portion of the resin sheet wound into a roll is manually adjusted to the molding position of the molding device, and then the resin sheet is removed. The feeding is performed at once at a high speed, and the process is repeated such that the mark is detected and then stopped for a predetermined time after dropping to a low speed just before the end of a predetermined length of feeding. Then, when the previous resin sheet is consumed and the next new resin sheet is supplied, the automatic operation of the transport device must be temporarily stopped, and then the manual positioning as described above must be performed.

[0003]

According to the above-described conventional resin sheet feeding control method, when a new resin sheet is supplied, the operation of the transport device must be stopped once and then the manual alignment must be performed. There is a need to do. For this reason,
A lot of time is required for the replenishment and adjustment work of the resin sheet, and it is necessary to perform test molding of 5 to 10 shots for such alignment, which is disadvantageous in that it takes too much time. If a new resin sheet is randomly supplied while the transport device is operating, the printed pattern on the molded product will be displaced because the resin sheet will not stop at the correct molding position. Occurs.

An object of the present invention is to provide a print pattern which can be controlled so that a newly supplied resin sheet having a print pattern can be set to an accurate molding position regardless of whether the conveying device is stopped or in operation. An object of the present invention is to provide a method for controlling the feeding of a resin sheet.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a method of clamping marks printed at equal intervals and clamping a side edge of a continuous resin sheet having a printed pattern corresponding to the marks. A method for controlling the feeding of a resin sheet using a transport device that intermittently feeds the resin sheet to a molding device by a predetermined length while being gripped by a chain, wherein the clamp is performed by a servomotor device having an encoder of the transport device. By driving the chain, the mark of the resin sheet sent at a low speed is detected by a sensor installed near the molding apparatus, and after detecting the mark, the resin sheet is sent at a high speed for a predetermined length. From a certain time.

[0006]

(Operation and Effect of the Invention) (Normal operation) A continuous resin sheet (hereinafter, referred to as a resin sheet) having a mark printed at equal intervals and a printed pattern corresponding to the mark is clamped at a side edge thereof. It is gripped by the chain and started to be fed at a low speed toward the forming device by the drive of the servomotor device. When the mark on the resin sheet is detected by a sensor installed near the molding machine, the rotation speed of the servo motor device increases, and the resin sheet is fed at a high speed for a predetermined length and then becomes constant. Stop for hours. At this time, the pulses generated from the encoder are counted from the time when the mark is detected, and the servo motor device is driven until the number of pulses matches the feed amount of the predetermined length. During the stop time, processing such as heating, molding, and trimming of the resin sheet is performed. After a certain stop time,
The resin sheet is fed again at a low speed, and the above-described series of feeding operations are sequentially repeated.

(Operation at the time of resin sheet replacement) When the previous resin sheet is consumed and the next new resin sheet is set and supplied, the terminal end of the previous resin sheet and the front end of the next resin sheet are used. The interval between each time of replenishment (random)
It is. At this time, when the first mark is detected by the sensor, the feeding of the resin sheet is temporarily stopped. Next, the number of pulses generated from the encoder of the servomotor device from the point of detection of the mark is counted, and after the servomotor device is driven to the number of pulses corresponding to the remaining amount of the feed amount of a predetermined length, the resin sheet is kept constant. Stop for hours. After the second mark is detected, the operation shifts to the normal operation described above.

According to the method for controlling the feeding of a resin sheet having a printed pattern, it is not necessary to stop the operation of the conveying device and manually set each time when supplying a new resin sheet. Adjustment work can be performed easily in a short time. In addition, there is an advantage in that the control can be performed so that the randomly supplied resin sheet is set to the correct molding position regardless of whether the transport device is stopped or in operation.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an outline of a system for controlling the operation of the transport device, FIG. 2 is a plan view of a resin sheet having a printed pattern, FIG. 3 is a speed diagram during normal operation, and FIG. It is a speed diagram in operation of.

In FIG. 1, reference numeral 1 denotes a conveying device for applying the resin sheet feeding control method of the present invention, and an endless clamp chain 3 is hung on sprockets 2 appropriately arranged on both sides of a machine frame (not shown). Hand over the clamp chain 3
A pulley 4 fixed coaxially with the sprocket 2 at the front end in the traveling direction of the motor, and a servomotor device 5 including an encoder 6
Is connected to the output shaft side by a timing belt 7.
As shown in FIG. 2, s is a continuous resin sheet on which a plurality of printed patterns d are provided for one shot in correspondence with the detection mark m printed at equal intervals and the mark m,
It is rotatably supported by the machine frame. The resin sheet s is held in a state where its side edge is held by the clamp chain 3.
It is provided so as to be intermittently fed into a molding device 8 composed of an upper die and a lower die by a predetermined length for each one shot.

The encoder 6 is directly connected to an output shaft of the servo motor device 5, and a pulse signal generated by the encoder 6 is input to a servo motor controller 10. 20 is a non-contact type sensor installed near the molding device 8 to detect the mark m of the resin sheet s, 21
Is a sensor controller. Reference numeral 30 denotes a control device provided to receive signals from the servo motor controller 10 and the sensor controller 21 and to issue a command to rotationally drive the servo motor device 5 in accordance with various molding conditions. Thus, the transport device 1 is configured.

Next, a specific control of the resin sheet feeding control method will be described. (Normal operation) The resin sheet s set in the conveying device 1 is driven by the servo motor device 5 toward the molding device 8 and initially has a velocity of about 0.2 m / s as shown in the velocity diagram of FIG. begin feeding at a low speed v _1. The mark m attached to the resin sheet s is detected by the sensor 20, the rotation speed of the servo motor system 5 is increased by an instruction of the control unit 30, at high speed v ₂ of the resin sheet s is about 2m / s After being sent for a predetermined length of one shot, the operation is stopped for a predetermined time. At this time, a pulse generated from the encoder 6 from the time x ₁ detects a mark m is counted by the counter in the control unit 30, the servo motor apparatus 5 sends a predetermined length which is calculated and commanded by the control unit 30 It will be driven up to the number of pulses corresponding to the amount. The initial setting of the positioning of the resin sheet with respect to the mold is performed by adjusting the position of the sensor 20 by an operator. During the stop time, heating and molding of the resin sheet s,
Known processing such as trimming is performed and the stop time has elapsed, again the resin sheet s is fed at a low speed v _1, sequentially repeating such a series of feeding operation.

(Operation at the time of resin sheet replacement) When the previous resin sheet is consumed and the next new resin sheet is set and supplied, the end of the previous resin sheet and the front end of the next resin sheet are used. Is not constant every time of replenishment. At this time, when the first mark m is detected by the sensor 20, the feeding of the resin sheet s is temporarily stopped as shown in FIG. Then, a pulse generated from the detection time point x ₂ of the mark m from the encoder 6 of the servo motor system 5 is counted by the counter in the control device 30. Next, after the servo motor device 5 is driven until the number of pulses matches the remaining amount of the feed amount of the predetermined length calculated and instructed by the control device 30, the resin sheet s is stopped for a predetermined time for the processing. . After the second mark m is detected, the operation shifts to the normal operation described above.

According to the method for controlling the feeding of a resin sheet having a printed pattern as described above, it is not necessary to stop the operation of the transport device and manually set the resin sheet one by one when supplying a new resin sheet. Replenishment and adjustment work can be easily performed in a short time. In addition, regardless of whether the transport device is stopped or in operation, the resin sheet can be reliably set at a predetermined position even when the resin sheet is randomly supplied.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an outline of a system for controlling the operation of a transfer device.

FIG. 2 is a plan view of a resin sheet with a printed pattern.

FIG. 3 is a velocity diagram during normal operation.

FIG. 4 is a velocity diagram in operation at the time of resin sheet replacement.

[Explanation of symbols]

s → resin sheet d → printing pattern m → mark x _1, x ₂
→ mark detection time v ₁ → low speed v ₂ → high speed 1 → transfer device 3 → clamp chain 5 → servo motor device 6 → encoder 8 → molding device 10 → servo motor controller 20
→ Sensor 30 → Control device

Claims (1)

[Claims] 1. A mark printed at equal intervals and a side edge of a continuous resin sheet having a printed pattern corresponding to the mark are gripped by a clamp chain, and the resin sheet is fixed to a molding apparatus. A method for controlling the feeding of a resin sheet using a conveying device that intermittently feeds a length of the resin sheet, wherein the clamp chain is driven by a servomotor device including an encoder of the conveying device, and the resin sheet is fed at a low speed. Marks are detected by a sensor installed near the molding apparatus, and after detecting the marks, the resin sheet is repeatedly fed at a high speed for a predetermined length and then stopped for a predetermined time. A method for controlling the feeding of a resin sheet with a printed pattern.